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Project Title & Location
SR900 / SE 78th Vic to Newport Way Vic Widening -- in Issaquah
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Project Description
This project will widen SR 900 from SE 78th vicinity north to Newport Way from 2 to 4 lanes and a two way left turn lane. The purpose is to add width and capacity to SR 900 to improve operations and safety.
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Contractor/Consultant
Project not yet advertised or awarded.
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Recent Progress
The Project Office has held predesign meetings with support groups and a field meeting with the Multi Agency Permitting team to review environmentally sensitive areas. Survey work and wetland delineation are complete and base map is being prepared. Alignment and channelization alternatives are being developed. Continuing to coordinate with the City of Issaquah.
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Design Construction Impacts
Balancing of impacts will be necessary. Widening to the east will cause wetland impacts. Widening to the west will require retaining walls and possible residence relocations. WSDOT will be coordinating with the City of Issaquah.
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Environmental Impacts / Compliance
R/W will be required for the lane widening and for mitigation of environmental impacts. Walls and steep slopes will be used to minimize impacts to wetlands. The existing bridge over Tibbetts creek will be replaced with a new structure for increased traffic carrying capacity.
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Impacts to Traffic
This project is targeted to improve efficiency of traffic operation. Construction will require non-peak lane closures and temporary detours.
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